International Journal of Trend in Scientific
Research and Development (IJTSRD)
International Open Access Journal
ISSN No: 2456 - 6470 | www.ijtsrd.com | Volume - 2 | Issue – 1
Dye Removal of Adsorption Study in
i
Thespesia Populnea Seed
R. Bhuvaneswari
Research scholar, Dept. of
Chemistry, Govt. Arts College for
Men, Nandanam,Chennai, India
K. Arivalagan
Assistant Professor, Dept. of
Chemistry, Govt. Arts College for
Men, Nandanam,Chennai, India
Subramanian Sivanesan
Head of the Dept. of Applied
Science and Technology, AC
College of Technology, Anna
University,
niversity, Chennai, India
ABSTRACT
The potential of Thespesia Populnea Seed (TPS)
powder, for the removal of Congo red 4B (CR) dye
from aqueous solution was investigated. The
adsorbent was characterized by FTIR and SEM
analysis. Batch adsorption studies were conducted and
various parameters such as pH, adso
adsorbent dosage,
initial dye concentration, contact time and
temperature were studied to observe their effects in
the dye adsorption process. The optimum conditions
for the adsorption of Congo red 4B onto the adsorbent
TPS was found to be contact time 75 min -1, pH 3,
temperature 303K for an initial dye concentration 22
mg/L and adsorbent dosage 0.12gm. The experimental
equilibrium adsorption data fitted to the Langmuir
isotherm and Freundlich isotherm model. The kinetic
data conformed to the Pseudo second orde
order kinetic
model, suggesting that the rate limiting steps may be
chemisorptions. Thermodynamic quantities such as
Gibbs free energy ∆G0, enthalpy ∆H0 and entropy ∆S0
were evaluated. The negative values of ∆G0 and the
negative value of ∆H0 obtained indicated the
spontaneous and exothermic nature of the adsorption
processes while the negative ∆S0 value obtained
decreased randomness during the adsorption process.
Keywords:: Adsorption ,Thespesia Populnea seed,
Congo red 4B
INTRODUTION
Adsorption technique is by far the most versatile and
widely used moreover, this processes become
economic if the adsorbent used is available and cheep
in cost. Thespesia Populanea (Malvaceae) is a large
tree found in tropical regions and coastal forests of
India opine 1. Various parts of T. Populanea are found
to possess useful medicinal properties, such as
antibacterial, antioxidant, purgative, anti fertility, antianti
inflammatory and heap to protective active opine2.
Moreover, all the parts of the TPS plant
pla have been
used in traditional system of medicine. Industries
manufacturing dye and dye intermediates are the
largest sector of chemical industries in India. There is
a variety of dyes like acid dyes, basic dyes, azo dyes,
mordent dyes, plastic dyes, etc.
etc The effluents from
these industries thus contain dyes as main pollutant 36
. Dye contaminated waste water originates from
various industries such as textile, leather, food,
dyeing, cosmetics etc. consequently, there is a
considerable need for the removal of dye from water
effluents prior to their discharge in to receiving water
7
. A huge amount of water us necessary by these
industries for the cleaning and washing purpose and
they discharge highly colored effluents containing
different dyes. Many investigators
investig
have studied the
feasibility of inexpensive alternative material like pear
millet husk, date pits, sawdust, buffing dust of leather
industry, coir pith, crude oil residue tropical grass,
olive stone and almond shells, pines bark, wood
waste, coconut shell, etc., as carbonaceous precursors,
for the removal of dyes from water and waste water.
Present study Congo red 4B is one of the types of acid
dyes. Congo red 4B is a heterocyclic aromatic
chemical compound with molecular formula
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International Journal of Trend in Scientific Research and Development (IJTSRD) ISSN: 2456-6470
C32N22N6Na2O6S2 fig. 1 Shows the structure of Congo
red 4B, its chemical name is sodium salt of Benzidine
azo-bis- napthaylamine-4 sulfonic acid and molecular
weight is 696.66 g/mol. Due to color change from
blue to re at pH 3-5 can be used as pH indicator.
Fig. 1 Structure of Congo red 4B dye
In the presence of color in the water bodies reduce
light penetration which in turn upsets the biological
metabolism process, disposal of dye waste water
without proper treatment destructed the aquatic
communities present in the ecosystem and some dyes
are reported to cause allergic dermatitis, skin
irritation, cancer and mutation in humans if they are
discharged as wastewater without any treatment 8-12.
There are no reports in this plant for adsorption
studies. This prompted us to do research work in this
adsorption of Congo red 4B dye using biomass from
Thespesia Populnea seed.
MATERIAL AND METHODS
MATERIAL
Thespesia Populnea seed (TPS) Ennore, Congo red
4B dye Cas.No: ASC 2562 Kevin laboratory (Avara
synthesis Pvt.Ltd.), pH meter, UV-1800 Double Beam
Spectrophotometer-(Shimadzu),
FTIRFourier
transform spectrophotometer, SEM-Scanning electron
microscopy (TEQIP Equipment), Orbital shaker, RBC Laboratory centrifuge and Weighing machine and
Air oven (Shimadzu).
METHODS
Adsorbent Collection and Preparations (TPS): The
Thespesia Populnea Seed (TPS) was collected from
Ennore (India). Their seed was washed thoroughly
with running tap water to removed sand, dirt and other
impurities present in it and dried in sunlight for one
week until all moisture were remove dried in an oven
at 500C. It was the ground well in a mixer and sieved
powdered. The TPS powder that passed through the
sieve were stored in an air tight container labeled TPS
and used as adsorbent without any further treatment.
Preparation of Adsorbate Solution: Analytical
grade Congo red 4B dye (C32N22N6Na2O6S2)
Molecular weight 696.68g/mol λ max =495nm was
obtained from the UV-spectrophotometer (Shimadaz
UV-1800) from Anna University (EM laboratory).
Purchased Avara synthesis Pvt.Ltd. Low cost
adsorbent. A stock solution Congo red 4B dye of
concentration 100 mg/L was prepared by dissolving
of 0.1g of powder adsorbate dye in 1L standard flask
filled with distilled water. Experimental dye solution
of desired concentration was obtained by appropriate
dilution of the stock solution. Correlation coefficient
value of dye concentration 100 mg/L value
(R2=0.997).
Batch Adsorption Experiments
Batch adsorption of Congo red 4B dye onto the
adsorbent TPS was conducted in a 250ml conical
flask containing 40ml of known concentration of the
CR dye solution and accurately weighed amount of
the adsorbents. The mixtures in the flask were
agitated on a mechanical shaker at a constant speed of
250 rpm. The effect of contact time (30, 45, 60 and
75) min-1, Adsorbent dosage (0.08, 0.10, 0.12 and
0.14) gm, Initial dye concentration (22, 24, 26, 28 and
30) mg/L, pH (3, 4, 5, 6, 7 and 8) and Temperature
(303, 313, 323 and 333) K were evaluated. The flask
containing the samples were withdrawn from the
shaker at predominant time intervals, filtered and the
final concentration of CR dye was determining using
the equation. The dye uptake capacity for each sample
was calculated according to a mass balance using
equation (1)
(1)
Where, m is the mass of adsorbent (g), v the volume
of the solution (L), C0 is the initial concentration of
dye
(mg /L), Ce is the equilibrium dye
concentration (mg/L) and qe is the amount of dye
quantity adsorbed at equilibrium (mg/g). The
percentage removal of dye from the solution was
calculated by the following equation (2)
(2)
Adsorption Isotherm
Two adsorption isotherms models were applied to
describe the sorption equilibrium in the present study
such as Langmuir and Freundlich isotherm model.
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International Journal of Trend in Scientific Research and Development (IJTSRD) ISSN: 2456-6470
Langmuir Isotherm
The Langmuir sorption isotherm is applied to
equilibrium sorption assuming monolayer sorption
onto a surface with finite number if identical sites.
The Langmuir equation is written as 13.
1/qe=1/qmKLCe + 1/qm
Freundlich Isotherm
The Freundlich isotherm is an empirical equation and
is one of the most widely used isotherms for the
description of multi site adsorption. The linear form
as follows:
(3)
Log qe = log KF + 1/n log Ce
Where, qe is the amount of dye adsorbed at
equilibrium (mg/g), q m is the amount of dye adsorbed
when saturation is attained (mg/g), Ce is the
equilibrium dye concentration (mg/L) and KL is the
Langmuir constant related to the binding strength of
the dye onto the adsorption. The Langmuir model
described the monolayer adsorption. It assumes a
uniform energy of adsorption, a single homogenous
layer of adsorbed solute at a constant temperature
Monolayer concentration increase with increase in
temperature Fig. 2(a)
Where, KF and n are the Freundlich isotherm
constants indication the adsorption capacity and
adsorption intensity respectively 14. The KF and n can
be calculated from the intercept and slop of the linear
plot of log qe against log Ce. The significance of n is
as follows; n=1(linear), n<1 (Chemical process), n>1
(Physical process). The Freundlich constant is
heterogeneous factor and indicated that adsorption
capacity the value of reflecting the more favorable
adsorption. Adsorption capacity increase with
increase in temperature Fig. 2(b)
0.4
log qe
1/qe
y = 2.1702x + 0.1005
0.3
R² = 0.9907
0.2
0.1
(4)
0.65
y = 0.6054x - 0.1012
0.6 R² = 0.9916
0.55
0.5
0
0
0.05
1/Ce
1
0.1
1.1
1.2
log Ce
1.3
(a)
(b)
Fig. 2 (a) Langmuir adsorption isotherm (b) Freundlich adsorption model TPS CR
Table1. Characteristic parameter of the adsorption isotherm model for CR adsorbing by TPS
Models
Isotherms Constants
Results
Langmuir
qm (mg/g)
KL (L/mg)
R2
10
0.046
0.990
Freundlich
1/n
N
KF(mg/g)
R2
0.605
1.652
-0.995
0.991
Adsorption Kinetics
The Pseudo first order and Pseudo second order
kinetic model were applied to study the adsorption
kinetics of Congo red 4B dye to compete the extent of
uptake in the adsorption processes.
Pseudo first order kinetic model
The linear form of the Lagergren’s Pseudo first order
kinetic model is represented by the rate equation (5)
(5)
Where, qe and qt are the values of amount of the dye
adsorbed per unit mass on the adsorbent at
equilibrium and at various time t, respectively K1 and
calculated qe can be from the slope and intercept
respectively of the linear plot of log (q e-qt) versatile 1516
Fig. 3(a). These plots are linear; however linearity
of these curves does not necessary assure first order
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International Journal of Trend in Scientific Research and Development (IJTSRD) ISSN: 2456-6470
mechanism. Due mainly to the inherent disadvantages
of correctly estimating equilibrium adsorption
capacity the value obtained from the values; therefore
first order kinetics is less likely to explain the rate
processes.
Pseudo second order kinetics
The integrated form of the above model becomes,
this model the rate determining step is biosorption
mechanism involving chemisorptions, Where
biosorbate removal from solution is due to physio
chemical interaction between biomass biosorbate
solution 17.
Intra particle diffusion model
The intra particle diffusion model is expressed as,
qt = Kidt1/2+C
(6)
Where qt is the amount of the adsorbed at contact
time t (mg/g), qe is amount of adsorbent adsorbed
(mg/g) on the adsorbent at equilibrium. The initial
adsorption rate h (mg.g-1min-1) is expressed as,
among these models the criterion for their
applicability is based on judgment the respectively
correlation coefficient (R2) and agreement between
experimental and calculated value of qe Fig. 3(b) In
log (qe-qt)
-0.5
50
100
y = -0.0139x - 0.314
R² = 0.8672
15
10
5
-1
0
-1.5
4.2
y = 0.2335x + 0.4032
R² = 0.9996
t/qt
0
20
Where Kid is the amount of adsorbate time t (mg/g)
and C is the variety of intercept (mg/g). A plot qt
versus t1/2 gives a linear relationship from which kid
values is determined from slope and value of C
intercept gives an idea about thickness of boundary
layer 15. This is attributed to the instantaneous
utilization of the most readily available adsorbing
sites on the adsorbent surface. Table 2
t/qt
0
(7)
4.15
y = 0.0446x + 3.8169
R² = 0.8835
4.1
4.05
0
50
Time
100
0
51/2
10
t
a
b
c
Fig. 3 (a) Pseudo first order (b) Pseudo second order (c) Intra particle diffusion kinetic models TPS CR
Time
Table2. Characteristic parameters of the adsorption kinetic model for CR adsorbing TPS
Kinetic model
Parameter
Results
Pseudo 1st order
K1 (min-1)
0.029
qe (mg/g)
0.686
2
R
0.867
Pseudo 2nd order
h (mg.g-1 min-1)
2.481
qe (mg/g)
4.291
R2
0.999
Intra particle diffusion
Kid
0.053
C
3.579
2
R
0.937
Thermodynamic Parameter
The Thermodynamics parameter such as change in
Gibbs’s free energy change (∆G0), enthalpy (∆H0) and
entropy (∆S0) were determined using the following
equation. The Gibbs free energy ∆G equation
expressed as following equation,
ΔG° = -RT ln K
(8)
Log K= ΔS°/ (2.303RT) - ΔH°/ (2.303RT)
(9)
Where K Equilibrium constant, R is universal gas
constant (8.314 Jmol-1K-1) and T is temperature
Kelvin, ∆S0 and ∆H0 are entropy and enthalpy
respectively. The plot of ln K versus 1/T gives a linear
respectively, which allows the computation of ∆S 0 and
∆H0 values from the slope and intercept respectively.
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International Journal of Trend in Scientific Research and Development (IJTSRD) ISSN: 2456-6470
ln K
For
the
negative
∆G0
values
indicates
thermodynamically spontaneous nature of the
adsorption. The decrease in ∆G values with increasing
temperature shows on increase in feasibility of
adsorption at higher temperature. The value of ∆H
was negative indicating that the nature of the
adsorption is exothermic. The negative value of ∆S
shows the decreasing randomness adsorbate solution
interface during the adsorption process.
0
0.0029 0.003 0.00310.00320.00330.0034
-0.5
-1
-1.5
1/T
y = 633.23x - 2.8688
R² = 0.9931
Fig. 4 Thermodynamic parameter 1/T vs. ln K
Temperature
(K)
303
Table3. Thermodynamics parameter TPS CR
∆G (J.mol-1)
∆H (KJ.mol-1)
∆S (J.mol-1.K-1)
-1977
313
-2183
323
-2451
333
-2685
-12.123
RESULTS AND DISCUSSION
Adsorbent characterization
UV spectrum
UV visible spectrum of adsorption bond 495nm was
noticed that the spectrum changes of adsorption bond
may confirm the strong bond between the active
group present in the inhibitor molecule and solid
surface. It can be used for detect the absorbance value
for the CR dye in different stages.
FTIR (Fourier Transform Infrared Spectroscopy)
The FTIR spectrum of TPS before and after
adsorption Fig. 5 of CR dye were analyzed to
determine the vibration frequency changes in their
functional groups for TPS before adsorption various
peaks at 500-3500cm-1, Changes in the vibration and
rotational movements of the molecule detection of
functional groups which have specific vibration
frequency. For example, C=O, NH2, -OH etc.
Before adsorption of CR dye (3908.04cm-1 and
3809cm-1) from –OH hydroxyl groups,(3319.58 cm-1
and 3249.57 cm-1) N-H str from Amide groups,
3119.25 cm-1
from NH3+ Ammonium salts of
carboxylic groups, 2915.41 cm-1 C-H str from
Alkanes, 2849.09 cm-1 C-H str from Aryl and
Aldehyde groups, 1736.95 cm-1 C=C str from
-54.91
R2
0.993
Alkenes, 1628.90 cm-1 C=O str from Ketones,
1440.89 cm-1 C-H def from Diaryl and Dialkyl
Esters. 1369.98 cm-1 N-O str from Nitro compounds,
-C-O str Alcohols, 1240.43 cm-1 C-O str from Esters
and Lactones, 1150.26 cm-1 S=O str from Amine
sulfides or Acids, 1017.46 cm-1 Salts of phosphate
esters, 800.62 cm-1 N-H str from salts of Hydroxyl
Halides , 690.39 cm-1 C-S str from Sulphonic acids ,
567.95 cm-1 -NO2 Aryl nitro compounds.
After adsorption of CR dye it was found that most of
the functional groups the adsorbent were affected
after the dye uptake process. This is judged from
shifts in the position of some of the functional groups
that moved at lower frequency or higher frequency or
band intensity before and after CR adsorption
includes 2913.50 cm-1 C-H str from Alkanes, 2853.56
cm-1 from C-H str from Alkyl groups, 1632.37 cm-1
NH3…SO3- from Amino sulfonic acids groups,
1525.40 cm-1 Aromatic compounds, 1015.12 cm-1 CO str Carbohydrates, 554.01 cm-1 Ar-X aryl halides
halogen groups respectively indicates involving of
these groups for CR binding to TPS.
SEM (Scanning Electron Microscopy)
Fig. 6 shows that SEM image of TPS powder it can be
observed from the external surface of TPS powder is
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International Journal of Trend in Scientific Research and Development (IJTSRD) ISSN: 2456-6470
very irregular with heterogeneous ridges and pores.
SEM micrographs of TPS before and after adsorption
are pictured in Fig. 6 respectively. The prepared TPS
presents a micro porous structure with different pore
diameters. In addition the TPS surface seems to be
rough and presents many protrusions before
adsorption. This adsorption the TPS morphology has
changed and the surface become smoother with less
visible process, indication an adsorption on both the
surface and within pores.
Fig. 5 FTIR Fourier Transform Infrared Spectroscopy for before and after adsorption on TPS CR
Fig. 6 SEM morphology image for TPS and TPS CR before and after adsorption
Influence of the Adsorption study
Effect of pH
The influence of pH on the adsorption of CR onto
TPS is illustrated in Fig 7a it was observed that the
percentage removal and adsorption capacity of CR by
TPS decrease as pH increase from 3 to 8 optimum
sorption was obtained at pH 3. The decrease in
percentage removal and adsorption capacity with
increase in pH can be attributing for the adsorption
sites on the adsorbent surface while the anionic
groups of the CR dye for the adsorption sites on the
adsorbent surface while at low pH values the negative
charge (-OH) in the solution decrease and the
adsorption surface is more positively charged thus
enhancing attraction of the anion of the CR dye.
Effect of adsorbent dosage
The effect of adsorbent dosage as the percentage of
CR dye as shown in Fig.7b it can be observed that the
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percentage of CR dye increased with increase in the
adsorbent dosage Although, the equilibrium
adsorption capacity decreased with increase of
adsorbent dosage. This is may be due to aggregation
of the adsorption sites which limits the availability of
all the active sites during adsorption process.
Effect of Initial dye concentration
The effect of initial dye CR concentration depicted in
Fig. 7c It can be observed that the percentage removal
of CR dye decrease with increase in initial
concentration. This is due to the fact increase in dye
concentration more dye molecules are available for
adsorption by the adsorbent. This is attributes to the
effects of concentration gradient which is the main
deriving forces for the adsorption process. As the
initial concentration increase, the available site on
adsorbent surface area becomes less which causing
increment in dye being adsorbed. However, these
removal dyes percentage decrease. Which is been
proved in Fig. 7c the experimental data showed of CR
adsorbed decrease in particle size of the adsorbent.
This indicated that the smaller TPS particles see for a
given mass of TPS the more surface area is available
and as a consequence the greater number of binding
sites available.
50
0
0
5
pH
10
74
73
72
71
70
a
0
0.1
0.2
Dose (gm)
48
46
44
42
0
b
20
Con (mg/L)
40
c
60
58
56
54
52
% removal
58
% removal
Effect of Temperature
The influence of temperature of the percentage
removal of CR dye TPS is illustrated in Fig. 7e it can
be observed the increase in temperature resulted in
decreased in percentage removal of CR by TPS. This
decrease in removal efficiency with increase in
temperature can be attribute to the weakening of the
physical bonding between the adsorbent CR dye and
the active sites of the adsorbent (TPS). In addition
the CR dye solubility also increases with increase in
temperature resulting in the interaction between the
solute and the solvents to be stronger than that
between the solute was more different to adsorbed.
% removal
% removal
% removal
100
Effect of Contact time
The effect of contact time on the removal of CR dye
is depicted in Fig. 7d it can be observed that there was
a rapid removal in the first 30 minute and it proceeds
slowly until result has been reported for the
adsorption of CR onto TPS powder. It can be inferred
from the rapid sorption rate at the initial stage that
there were great quantity of active site on the external
surface of TPS which resulted in the swift CR dye
removal. Once equilibrium is attained there was
further increase since the remaining vacant sites are
difficult to occupy probably due to the adsorbents and
the bulk phase.
57
56
55
0
50
Time (K)
100
0
50
100
Temperature (T)
d
e
Fig. 7 Effects of (a) pH, (b) Adsorbent dosage, (c) Initial dye concentration, (d) Contact time, (e)
Temperature TPS CR
CONCLUSION
Dyes are generally present in the effluents of textile
industries. They are distribute in soils aquatic
environment and are known to be a source of
environment contaminates so the necessary demands
to focus the attention on technique leading to
complete removal of dye molecule. The removal of
Congo red 4B from industries wastewater using
biomass (TPS) has been investigated under different
experimental conditions. The adsorbing of CR dye
was examined at different experimental conditions.
The results corrugate that adsorption increase in
increase contact time, temperature, adsorbent dosage
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and pH. The maximum removal of dye CR at 303K
was found to be 57.73% for TPS, 75min-1 was found
to be 57.79%, 22mg/L was found to be 47.72%, 0.12g
was found to be 73.51% and pH was found to be
77.74% at maximum percentage removal in this
study. Kinetic study shows the adsorption reaction
follows Pseudo second order kinetic model
(R2=0.999). The equilibrium data were found to be
well represented by Freundlich isotherm shows that
the surface is heterogeneous in nature. The percent
research work established that TPS was excellent lowcost bio adsorbent for the removal of dye CR. The
negative values of ∆G0 and the negative value of ∆H0
obtained indicated the spontaneous and exothermic
nature of the adsorption process while the negative
∆S0 value obtained decreased randomness during the
adsorption process. The kinetic and thermodynamic
data can be Further explore for the design of an
adsorbed for industrial effluents treatment.
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@ IJTSRD | Available Online @ www.ijtsrd.com | Volume – 2 | Issue – 1 | Nov-Dec 2017
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